CN1598509A - Temp. moisture monitoring meter and method for correcting error of platinum thermal resistance - Google Patents
Temp. moisture monitoring meter and method for correcting error of platinum thermal resistance Download PDFInfo
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Abstract
The invention is a temperature and humidity meter, which includes channel selecting circuit, constant current source circuit, signal amplifying circuit, A/D converting circuit and USB bus interface model, several elements to be measured, each element forms a loop with the channel selecting circuit and constant current source circuit, the voltage between two ends of each element is transmitted to the signal amplifying circuit to be amplified through the channel selecting circuit, and it is converted into digital signal from analog signal through the A/D conversion circuit, and it is transmitted to the input end of the USB bus interface the interface model outputs the channel selecting signal to the channel selecting circuit, the USB interface is connected to the USB interface of PC. The invention is connected to external computer and controlled by the computer; the data is stored in the memory of the computer for carrying on data analysis and management. The invention also provides an error correcting method for platinum heating resistance, in order to achieve the cheap sensor, but acquires the high accuracy.
Description
Technical field
The present invention relates to a kind of temperature and humidity measurement instrument, particularly a kind of micro-processor controlled temperature and humidity inspection measuring instrument and platinum resistance sensor error correcting method wherein.
Background technology
Temperature and humidity measurement instrument great majority in the market are based on the intelligent instrument of single chip microcomputer, generally do not revise the error that sensor brings to measurement, adopt the structure of upper and lower computer, measurement instrument is by RS-232 or add that 485 are connected with host computer, is mainly used in on-the-spot industrial measurement and control.The survey crew of metrological service, environmental testing department carries based on the operation of going out of the intelligent humiture instrument of single chip microcomputer, generally takes two kinds of methods, and a kind of is that hand-kept measurement data or the mini-printer that utilizes instrument to carry are printed measurement data; Another kind is temporarily to be stored in measurement data in the intelligence instrument, if instrument has memory function, again measurement data is sent to external computing machine after getting back to office, as the PC personal computer, do further measurement data analytical work, if measurement data is more, then the limited storage area of intelligence instrument is just powerless.In addition, when measuring accuracy is had relatively high expectations, must use expensive high-precision sensor.The sensor of common, inexpensive, for example, the allowable error 0 ℃, 200 ℃ and-100 ℃ when B level PT100 platinum resistance thermometer sensor, sensor dispatches from the factory is respectively ± 0.12 Ω, ± 0.48 Ω and ± 0.32 Ω, be converted into ± 0.3 ℃ approximately of temperature, ± 1.3 ℃ and ± 0.8 ℃.As seen, on the market based on the general intelligence type instrument of single chip microcomputer, although its display precision may be higher, but owing to do not revise the error that sensor brings to measurement, the have to high-precision sensor of purchasing price costliness of user, if measuring instrument has 24 passages, buy 24 expensive sensors, be a no small spending to the user.
Summary of the invention
The objective of the invention is to propose a kind ofly directly to be connected with external computing machine, by the direct storing measurement data of external computing machine, carry out measurement data analysis, data management: as inquiry, printing, deletion, backup etc., and by the directly actuated temperature and humidity inspection measuring instrument of external computing machine.
Another object of the present invention is the error correcting method that proposes platinum resistance sensor in a kind of temperature and humidity inspection measuring instrument.
For achieving the above object, a scheme of the present invention provides a kind of temperature and humidity inspection measuring instrument, comprise channel selection circuit, constant-current source circuit, signal amplification circuit, A/D change-over circuit and usb bus interface module, a plurality of measured elements, wherein each measured element constitutes the loop through channel selection circuit and constant-current source circuit, wherein the voltage at each measured element two ends is input to the signal amplification circuit amplification through channel selection circuit, convert digital signal to through the A/D change-over circuit again, be input to the data input pin of usb bus interface module, the data output end output gating road control signal of described usb bus interface module, and being input to the passage gating control end of channel selection circuit, the USB interface of described usb bus interface module connects external USB interface of computer.The different gating road control signal of data output end output by the described usb bus interface module of external computer control, the passage at each measured element place of gating in turn, thereby described a plurality of measured elements, the voltage at its two ends are input to signal amplification circuit in turn and amplify.External computing machine can be selected the PC personal computer for use, can use laptop computer especially.
Described a plurality of measured element, one of them can be that resistance does not vary with temperature and the accurate wire-wound resistor that changes the platinum resistance sensor that all the other change for resistance varies with temperature.
Described A/D change-over circuit can comprise A/D conversion chip sum counter, after the CLK clock signal of A/D conversion chip and BUSY busy signal carry out the logical and operation, be input to the input end of clock of counter as count pulse, so that the width to BUSY output signal high level is counted, the digital signal that the count value of described counter output converts to as the A/D change-over circuit.
Another scheme of the present invention provides the error correcting method of platinum resistance sensor in a kind of temperature and humidity inspection measuring instrument, and this method comprises the following steps:
Detect 0 ℃ of resistance nominal value of platinum resistance thermometer sensor, R of this channel presetting
0' and the nominal ratio W of 100 ℃ of resistance and 0 ℃ of resistance
100',
If 0 ℃ of resistance nominal value R
0' be not equal to standard value, the nominal ratio W of 100 ℃ of resistance and 0 ℃ of resistance
100' equal standard value, then according to the platinum resistance thermometer sensor, value R that measures
t', according to formula:
R
t＝R
t’(R
0/R
0’)
Wherein: R
0Standard electric resistance when being 0 ℃,
R
0' resistance nominal value when being 0 ℃;
Obtain platinum resistance thermometer sensor, standard value R through revising
t, divide kilsyth basalt to converse corresponding temperature according to the standard platinum thermal resistance again;
If 0 ℃ of resistance nominal value R
0' be not equal to standard value, the nominal ratio W of 100 ℃ of resistance and 0 ℃ of resistance
100' be not equal to standard value, then according to the platinum resistance thermometer sensor, value R that measures
t', converse corresponding temperature by the special-purpose kilsyth basalt that divides of the platinum resistance thermometer sensor, of this passage;
If 0 ℃ of resistance nominal value R
0' equal standard value, the nominal ratio W of 100 ℃ of resistance and 0 ℃ of resistance
100' equal standard value, then according to the platinum resistance thermometer sensor, value R that measures
t', divide kilsyth basalt to converse corresponding temperature according to the standard platinum thermal resistance.
Wherein, the special-purpose kilsyth basalt that divides of the platinum resistance thermometer sensor, of described passage obtains according to following step: at first, and according to formula:
A’＝(W
100’-1-B×100
2)/100
Wherein: W
100' be the 100 ℃ of resistance of platinum resistance thermometer sensor, of this passage and the nominal ratio of 0 ℃ of resistance,
B is a known constant,
Obtain revised constant A ' value,
Then:
When temperature in-100 ℃～0 ℃ scope, by formula
R
t’＝R
0’[1+A’t+Bt
2+Ct
3(t-100)]
Wherein: R
0' resistance nominal value when being 0 ℃ of the platinum resistance thermometer sensor, of this passage,
A ' is described revised constant,
B is a known constant,
C is another known constant,
When temperature in 0 ℃～250 ℃ scopes, by formula
R
t’＝R
0’(1+A’t+Bt
2)
Wherein: R
0' resistance nominal value when being 0 ℃ of the platinum resistance thermometer sensor, of this passage,
A ' is described revised constant,
B is a known constant,
Obtain the special-purpose kilsyth basalt that divides of platinum resistance thermometer sensor, of this passage, during measurement, according to the platinum resistance thermometer sensor, value R that measures
t', utilize this special use to divide kilsyth basalt to converse corresponding temperature t.
Because the present invention selects for use the usb bus interface module directly to be connected with external computing machine, the gauger can be under the Windows environment of being familiar with operating instrument, the operation interface close friend, easy to use, measurement data directly leaves computing machine in general Microsoft Access form, be convenient to do data analysis and handle, have data management: it is investigated functions such as inquiry, printing, deletion, backup in full; External computing machine is by the different gating road control signal of control usb bus interface module output, and gating each measured passage of the present invention is patrolled and examined automatically in turn, carry out data acquisition, if external computing machine is selected laptop computer for use, then possess portable characteristics, be convenient to go out measure.
And, 0 ℃ of resistance value of the software correction platinum resistance sensor by external computing machine, 100 ℃ with 0 ℃ of approach such as resistance ratio, improve temperature measurement accuracy, use cheap sensor to reach, still can guarantee higher temperature and humidity measurement precision.
Description of drawings
Below be the explanation of accompanying drawing drawing:
Fig. 1 is a circuit working functional-block diagram of the present invention;
Fig. 2 A, Fig. 2 B, Fig. 2 C are the circuit theory diagrams of the embodiment of the invention;
The USB2004 module 40 core IDC40 socket J2 number of pins definition that Fig. 3 adopts for the embodiment of the invention;
Fig. 4 is the external computer software function module process flow diagram of the embodiment of the invention;
Fig. 5 is the external computer software measurement parameter setting module process flow diagram of the embodiment of the invention;
Fig. 6 is that the external computer software wet and dry bulb coefficient and the air pressure of the embodiment of the invention is selected the module process flow diagram;
Fig. 7 is this passage platinum resistance thermometer sensor, special-purpose branch kilsyth basalt generation module process flow diagram of the external computer software of the embodiment of the invention to the platinum resistance thermometer sensor, correction;
Fig. 8 is the external computer software temperature and humidity measurement module process flow diagram of the embodiment of the invention;
Fig. 9 is the external computer software data management module process flow diagram of the embodiment of the invention;
Figure 10 is the process flow diagram of the error correcting method of the platinum resistance thermometer sensor, in the external computer software temperature and humidity measurement module process flow diagram of the embodiment of the invention.
Embodiment
The CONSTRUCTED SPECIFICATION of the embodiment of the invention is described in detail in detail below in conjunction with accompanying drawing:
As shown in Figure 1, be circuit working functional-block diagram of the present invention, a kind of temperature and humidity inspection measuring instrument of the present invention comprises channel selection circuit 1, constant-current source circuit 2, signal amplification circuit 3, A/D change-over circuit 4 and usb bus interface module 5, a plurality of measured elements, wherein each measured element constitutes the loop through channel selection circuit 1 and constant-current source circuit 2, wherein the voltage at each measured element two ends is input to signal amplification circuit 3 amplifications through channel selection circuit 1, convert digital signal to through A/D change-over circuit 4 again, be input to the data input pin of usb bus interface module 5, the data output end output gating road control signal of described usb bus interface module 5, and being input to the passage gating control end of channel selection circuit 1, the USB interface of described usb bus interface module 5 connects the USB interface of external computing machine 6;
The different gating road control signal of data output end output of external computing machine 6 control usb bus interface modules 5, the passage at each measured element place of gating in turn, thereby described a plurality of measured elements, the voltage at its two ends are input to signal amplification circuit 3 in turn and amplify.
Described a plurality of measured element, one of them is that resistance does not vary with temperature and the accurate wire-wound resistor that changes the four-wire system platinum resistance sensor that all the other change for resistance varies with temperature.
Be depicted as the circuit theory diagrams of the embodiment of the invention as Fig. 2 A, Fig. 2 B, Fig. 2 C;
Shown in Fig. 2 A, 32 passages are arranged, be divided into four groups, every group of 8 passages, wherein, 31 measured elements place the passage at place, and a channel standby is in 31 measured elements, one of them is that resistance does not vary with temperature and the accurate wire-wound resistor Rx that changes, the Rx resistance value is 197.60 Ω ± 0.05%, and all the other 30 for resistance varies with temperature the four-wire system platinum resistance sensor R1 to R30 that changes, and selects the PT100 platinum resistance thermometer sensor, for use; The effect of using accurate wire-wound resistor Rx is a current value of asking for constant-current source circuit 2, uses the reason of accurate wire-wound resistor Rx to have three: at first, the about 1mA of electric current that the constant-current source circuit 2 of every temperature and humidity inspection measuring instrument inside provides is difference slightly; Secondly, the electric current that the constant-current source circuit 2 of same temperature and humidity inspection measuring instrument inside provides also can be in time slow slight fluctuations; The 3rd, the resistance of accurate wire-wound resistor itself can be regarded as constant in this apparatus measures scope, so whenever take turns the beginning of patrolling and examining, the temperature and humidity inspection measuring instrument is under the control of external computing machine 6, at first automatic gating Rx passage, and the voltage at measure R x two ends, according to actual measured value, and the resistance value of known accurate wire-wound resistor Rx, ask for the output current of constant-current source circuit 2, again gating platinum resistance sensor passage automatically, according to the platinum resistance sensor both end voltage that records, and the output current of the constant-current source circuit of asking for 2, ask for the platinum resistance thermometer sensor, value, reduce the error of calculating the platinum resistance thermometer sensor, value.
Shown in Fig. 2 A, 31 measured elements are divided into four groups, first group of 8 measured element, 1 accurate wire-wound resistor Rx and 7 platinum resistance thermometer sensor, R1 to R7, second group of 8 measured element, 8 platinum resistance thermometer sensor, R8 to R15, the 3rd group of 7 measured elements, 7 platinum resistance thermometer sensor, R16 to R22, one of them channel standby, the 4th group of 8 measured elements, 8 platinum resistance thermometer sensor, R23 to R30;
Four groups of channel circuits, wherein first group of channel circuit comprises first eight tunnels analogies switch U1, second eight tunnels analogy switch U5 and the 3rd eight tunnels analogy switch U9, second group of channel circuit comprises first eight tunnels analogies switch U2, second eight tunnels analogy switch U6 and the 3rd eight tunnels analogy switch U10, the 3rd group of channel circuit comprises first eight tunnels analogies switch U3, second eight tunnels analogy switch U7 and the 3rd eight tunnels analogy switch U11, the 4th group of channel circuit comprises first eight tunnels analogies switch U4, second eight tunnels analogy switch U8 and the 3rd eight tunnels analogy switch U12;
Shown in Fig. 2 A, label is DB25[13], DB25[14] and DB25[15] three signal line control gating passage.
Shown in Fig. 2 B, the group gating circuit comprises first eight tunnels analogies switch of group U13, second eight tunnels analogy switch U14 of group and organizes the 3rd eight tunnels analogy switch U15;
Shown in Fig. 2 A, 2B, four groups of channel circuits all adopt the MC14051 chip with the eight tunnels analogy switches of organizing gating circuit.
The effect of group gating circuit is a certain group of four groups of channel circuits among gating Fig. 2 A.Shown in Fig. 2 B, label is DB25[1], DB25[5] and DB25[9] three signal line gating Fig. 2 A in first group of channel circuit; Label is DB25[2], DB25[6] and DB25[10] three signal line gating Fig. 2 A in second group of channel circuit; The rest may be inferred by analogy.
Shown in Fig. 2 A, four groups of measured elements, one end one tunnel of each the measured element in first group connects the input end of first eight tunnels analogies switch U1 of first group of channel circuit, another road connects the input end of second eight tunnels analogy switch U5 of first group of channel circuit, the other end of each the measured element in first group, one the tunnel connects the input end of the 3rd eight tunnels analogy switch U9 of first group of channel circuit, another road ground connection; Second group, the 3rd group, the 4th group, the method for attachment of these three groups of measured elements is identical with first group.
As Fig. 2 A, shown in the 2B, four groups of channel circuits, wherein each organizes first eight tunnels analogies switch U1 of channel circuit, U2, U3, the output terminal X of U4 connects the input end of first eight tunnels analogies switch of group U13 of group gating circuit, second eight tunnels analogy switch U5 of each group channel circuit, U6, U7, the output terminal X of U8 connects the input end of second eight tunnels analogy switch of the group U14 of group gating circuit, the 3rd eight tunnels analogy switch U9 of each group channel circuit, U10, U11, the output terminal X of U12 connects the input end of the 3rd the eight tunnels analogy switch U15 of group of group gating circuit
The group gating circuit, wherein organize the output termination constant-current source circuit 2 of first eight tunnels analogies switch U13, organize an input end of the output termination signal amplification circuit 3 of second eight tunnels analogy switch U14, organize another input end of the output termination signal amplification circuit 3 of the 3rd eight tunnels analogy switch U15
Shown in Fig. 2 C, the USB2004 module that the usb bus interface module 5 of the embodiment of the invention adopts Beijing Altay scientific ﹠ trading Co., Ltd. to produce, the gating road control signal of the data output end output of usb bus interface module 5 is divided into passage gating signal and group gating signal, the passage gating signal is the gating road control signal of four groups of channel circuits, be used to control the passage at the measured element of gating place, the group gating signal is the gating road control signal of group gating circuit, be used for a certain group of four groups of channel circuits of gating, as Fig. 2 B, shown in the 2A, the passage gating signal of the data output end output of USB2004 module, label is IDC40[21], IDC40[20] and IDC40[19] three signal line, after driver drives, label is DB25[13], DB25[14] and DB25[15] three signal line, be input to first eight tunnels analogies switch U1 of each the group channel circuit in four groups of channel circuits, U2, U3, U4, second eight tunnels analogy switch U5, U6, U7, U8 and the 3rd eight tunnels analogy switch U9, U10, U11, the passage gating control end A of U12, B, C, control gating passage; The group gating signal of the other data output end output of USB2004 module, label is IDC40[25], IDC40[24] and IDC40[23] three signal line, after driver drives, be input to first eight tunnels analogies switch of group U13, second eight tunnels analogy switch U14 of group that organizes gating circuit and passage gating control end A, B, the C that organizes the 3rd eight tunnels analogy switch U15, a certain group of controlling four groups of channel circuits of gating.
Above-mentioned driver adopts photoelectrical coupler TLP521-4 chip, and this is because passage gating signal and group gating signal must drive a plurality of chips simultaneously, so adopt two TLP521-4 chips to improve the signal driving force.
Certainly, when counting seldom that needs are measured, a plurality of measured elements do not need grouping, as: establish measured element and have only 8, the multichannel analog switch is selected eight tunnels analogy switches for use, then channel selection circuit 1 can only be one group of channel circuit, this channel circuit comprises three eight tunnels analogy switches, 8 measured elements, wherein an end one tunnel of each measured element connects the input end of first eight tunnels analogies switch, another road connects the input end of second eight tunnels analogy switch, the other end of each measured element, one the tunnel connects the input end of the 3rd eight tunnels analogy switches, another road ground connection, the output termination constant-current source circuit 2 of described first eight tunnels analogies switch, an input end of the output termination signal amplification circuit 3 of described second eight tunnels analogy switch, another input end of the output termination signal amplification circuit 3 of described the 3rd eight tunnels analogy switch, the gating road control signal of the data output end output of described usb bus interface module 5, after driver drives, be input to the passage gating control end of described three eight tunnels analogy switches, with the some passages in the passage of 8 measured elements of gating place.
Shown in Fig. 2 B, the constant-current source circuit 2 of the embodiment of the invention is made of LM308 operational amplifier U16 and peripheral circuit thereof, is the 1mA constant current source.Constant-current source circuit 2 electric currents are by resistance R 35 outputs, the measured element of flowing through behind group gating circuit and the two-layer MC14051 eight tunnels analogy switches of channel circuit.
Voltage signal from measured element two ends, through being input to the signal amplification circuit 3 that mainly constitutes behind channel circuit and the two-layer MC14051 analog switch of group gating circuit by AD524 exact instrument amplifier chip U23, voltage signal is through after amplifying, be set at and amplify 10 times, be input to A/D change-over circuit 4.
A/D change-over circuit 4 comprises A/D conversion chip sum counter, after the CLK clock signal of A/D conversion chip and BUSY busy signal carry out the logical and operation, be input to the input end of clock of counter as count pulse, so that the width to BUSY output signal high level is counted, the digital signal that the count value of counter output converts to as A/D change-over circuit 4.
Shown in Fig. 2 B, A/D conversion chip U18 adopts the ICL7135 chip, counter adopts two 74LS590 eight-digit binary number counter U21, U22, import ICL7135A/D conversion chip U18 through the voltage signal that signal amplification circuit 3 amplifies, the CLK clock signal terminal of A/D conversion chip U18 and BUSY busy signal end are connected with the input end of a Sheffer stroke gate among the CD4011 Sheffer stroke gate U24A respectively, the input end of clock of a 74LS590 eight-digit binary number of the output termination counter U21 of this Sheffer stroke gate, the input end of clock of another 74LS590 eight-digit binary number counter of carry output termination U22 of this counter U21, described two 74LS590 eight-digit binary number counter U21, the common formation of U22 16 digit counters, the count value of this 16 digit counter output is input to the data input pin of USB2004 module as digital signal, label is IDC40[1] to IDC40[8] and IDC40[10] to IDC40[16], described two 74LS590 eight-digit binary number counter U21, the clear terminal of U22 connects the one digit number of USB2004 module jointly according to output terminal IDC40[29], the one digit number of the BUSY busy signal termination USB2004 module of A/D conversion chip U18 is according to input end IDC40[9].
Shown in Fig. 2 B, the 25th pin Run/Hold of ICL7135 A/D conversion chip U18 connects high level, and U18 is changed to continuous transition status with the ICL7135A/D conversion chip.The 250KHz clock signal that clock circuit produces, be input to the 22nd pin CLK of ICL7135A/D conversion chip U18, the slewing rate of ICL7135A/D conversion chip U18 is 6.25 times/second, the Busy output signal of ICL7135A/D conversion chip U18, the width range of its high level is 10001 to 30001 clocks, width to Busy output signal high level is counted, counting clock is the 250KHz clock signal that is input to ICL7135A/D conversion chip U18, then count value deduct 10001 poor, from 0 to 20000 unit of scope, the output valve that can represent A/D to change.
Shown in Fig. 2 B, two 74LS590 eight-digit binary number counter U21 and U22 constitute 16 digit counters, U21 is the least-significant byte of 16 digit counters, U22 is the most-significant byte of 16 digit counters, after 250KHz clock signal and Busy signal carry out the logical and operation, be input to the input end of clock of U21 as count pulse.Because counting region is between 10001 to 30001, computing machine only reads low 15 of 16 digit counters, needn't read the most significant digit of 16 digit counters.
Adopt general usb interface module USB2004 module with being connected of external computing machine 6.External computing machine 6 reads the output valve of A/D conversion by the USB2004 module, and sends gating road control signal by the USB2004 module.Shown in Fig. 2 B and 2C, circuit is connected with the USB2004 module by IDC40 socket J2, and the USB interface J1 of USB2004 module is connected with the USB interface of external computing machine 6.Shown in Fig. 2 C, it is the USB2004 module diagram, be illustrated in figure 3 as the 40 core IDC40 socket J2 number of pins definition of USB2004 module, the USB2004 module has 16 inputs and 16 output I/O signals, 15 input signals, label is IDC40[1] to IDC40[8] and IDC40[10] to IDC40[16], be used to read 16 digit counter U21 and U22 low 15, remaining 1 input signal, label is IDC40[9], be used to read in the Busy signal of A/D conversion chip U18, differentiate the A/D conversion and whether finish; Use 3 output signals, label is IDC40[25], IDC40[24] and IDC40[23], as the group gating signal, other 3 output signals, label is IDC40[21], IDC40[20] and IDC40[19], as the passage gating signal, 1 output signal, label is IDC40[29], as the reset signal of 16 digit counter U21 and U22
The A/D translation data that external computing machine 6 collects, it is the PT100 platinum resistance sensor both end voltage value after amplifying, according to the signal amplification factor of AD524 exact instrument amplifier chip U23 and the current value of constant-current source circuit 2, can ask for the thermoelectric resistance of PT100 platinum resistance thermometer sensor,, divide kilsyth basalt and relative humidity table for reference by the PT100 platinum resistance thermometer sensor, that leaves Computer Database in then, computing machine converses the humiture value automatically.
The embodiment of the invention adopts Pt100 four-wire system platinum resistance sensor, cooperates measurement with wet to measure humiture.It can be patrolled and examined to 30 channel temperatures or maximum 15 channel temperatures and 15 passage humidity automatically to 1 passage.Each passage can be chosen as by setting and measure temperature, measures humidity or do not use one of three kinds of states of this passage.
Measurement range: temperature-100 ℃-+250 ℃;
Select for use general usb bus interface module USB2004 module directly to be connected with external computing machine 6, instrument has portable characteristics, measures applicable to going out.External computing machine 6 sends gating road control signal, carries out data acquisition by usb bus interface module 5.Software adopts Microsoft Visual Basic programming, operates under the Windows environment, and measurement data directly leaves computing machine in general Microsoft Access form.Has the measurement data analyzing and processing, management functions such as data query, printing, deletion, backup.
0 ℃ of resistance value R by external computer software correction PT100 platinum resistance thermometer sensor,
0', 100 ℃ and 0 ℃ of resistance ratio W
100 'Etc. approach, improve temperature measurement accuracy, owing to adopt measurement with wet to measure humidity, the temperature difference by wet and dry bulb converses humidity, so the raising of temperature measurement accuracy can improve the precision of moisture measurement to a certain extent.Use cheap sensor to reach, B level PT100 platinum resistance thermometer sensor, adds measurement with wet, still can guarantee higher measuring accuracy.
A kind of temperature and humidity inspection measuring instrument of the present invention mainly has following three advantages:
1. the temperature and humidity inspection measuring instrument directly is connected with external computing machine, the gauger can be under the Windows environment of being familiar with operating instrument, the operation interface close friend, easy to use.Measurement data directly leaves external computing machine in general Microsoft Access form, is convenient to do data analysis and handles.Have functions such as data query, printing, deletion, backup.
2. use the usb bus interfacing.Have portable characteristics, can cooperate laptop computer to use, be convenient to go out measure.
3. utilize external computer software correction platinum resistance sensor error, improve measuring accuracy, to reach the sensor that uses common, inexpensive, B level PT100 platinum resistance thermometer sensor, adds measurement with wet, still can guarantee higher temperature and humidity measurement precision.
A kind of temperature and humidity inspection measuring instrument of the present invention adds measurement with wet when temperature sensor uses B level PT100 platinum resistance thermometer sensor,, and measuring error is as follows:
Temperature ± 0.1 ℃, 0 ℃-100 ℃; ± 0.2 ℃, during other temperature.
Humidity ± 1%RH, 40%RH-100%RH; ± 2%RH is during other humidity.
Existing general temperature and humidity inspection measuring instrument, when temperature sensor use B level PT100 platinum resistance thermometer sensor,, measuring error is as follows:
Temperature is greater than ± 0.3 ℃, 0 ℃-100 ℃.
Humidity is generally greater than ± 3%RH.
A kind of temperature and humidity inspection measuring instrument of the present invention adopts general usb interface module with being connected of external computing machine, meets the trend of Computer Interface Technology development.Following PC may be connected with all peripheral hardware by usb bus, and USB will replace serial ports all on the current PC and parallel port.In addition, the plug-and-play feature of USB and hot plug function can be brought great convenience to the gauger.External computing machine is by the gating passage line data collection of going forward side by side that transmits control signal of usb bus interface.The software of the embodiment of the invention uses Microsoft Visual Basic programming, and the storage and managenent of measurement data is selected Microsoft Access data layout for use.Software is at Windows 9X/me, and Windows 2000, and Windows XP operating system environment is operation down, and the person of being convenient for measuring manipulates, and also is convenient to the gauger and does the work of further measurement data analyzing and processing.
The temperature sensor of the embodiment of the invention is selected B level PT100 platinum resistance thermometer sensor, for use, the PT100 platinum resistance thermometer sensor, is a kind of temperature sensor commonly used, it measures temperature range between-200 ℃-850 ℃, allowable error 0 ℃, 200 ℃ and-100 ℃ when B level PT100 platinum resistance thermometer sensor, dispatches from the factory is respectively ± 0.12 Ω, ± 0.48 Ω and ± 0.32 Ω, be converted into ± 0.3 ℃ approximately of temperature, ± 1.3 ℃ and ± 0.8 ℃.As seen, revise 0 ℃ of resistance value R of PT100 platinum resistance thermometer sensor,
0' and resistance ratio W
100 ', promptly the ratio of 100 ℃ of resistance values and 0 ℃ of resistance value can improve measuring accuracy to a certain extent.0 ℃ of resistance value R when the PT100 platinum resistance thermometer sensor, is dispatched from the factory
0' and resistance ratio W
100 'Nominal value, also be PT100 platinum resistance thermometer sensor, 0 ℃ of actual resistance R when dispatching from the factory
0' and the ratio W of 100 ℃ of actual resistances and 0 ℃ of actual resistance
100 ', the input computing machine is stored in the database database file name RW.
Be the correction algorithm of two kinds of practicalities below.
1. only consider 0 ℃ of resistance value R
0' depart from standard value is brought error to measurement correction algorithm
This is a kind of fairly simple correction algorithm.The resistance standard value of the accurate PT100 platinum resistance thermometer sensor, of bidding when 0 ℃ and temperature t is respectively R
0And R
tThe resistance value of the actual PT100 platinum resistance thermometer sensor, that uses when 0 ℃ and temperature t is respectively R
0' and R
t', then
R
0’/R
0＝R
t’/R
t
R
t＝R
t’(R
0/R
0’) ……………… (1)
Wherein: R
0Standard electric resistance when being 0 ℃,
R
0' resistance nominal value when being 0 ℃;
During measurement, the platinum resistance thermometer sensor, value R during according to the temperature t that measures
t', the platinum resistance thermometer sensor, standard value R through revise of first application formula (1) when asking temperature t
t, search the standard platinum thermal resistance again and divide kilsyth basalt to converse R
tThe temperature that value is corresponding.
2. consider 0 ℃ of resistance value R simultaneously
0' and resistance ratio W
100 'Depart from standard value and bring the correction algorithm of error to measurement
The computing formula of platinum resistance thermometer sensor, has two:
In-200 ℃～0 ℃ scope, use
R
t＝R
0[1+At+Bt
2+Ct
3(t-100)]…?…?…?…?…?…?…(2)
In 0 ℃～850 ℃ scopes, use
R
t＝R
0(1+At+Bt
2) …?…?…?…?…?…?…?…?…?…(3)
Wherein: A is a constant, A=3.90802 * 10
-3/ ℃
B is a constant, B=-5.802 * 10
-7/ ℃
C is a constant, C=-4.2735 * 10
-12/ ℃
The actual PT100 platinum resistance thermometer sensor, that uses, because the influence of factors such as purity, A, B, three values of C and standard value slightly depart from.The measurement range of temperature and humidity inspection measuring instrument of the present invention-100 ℃～250 ℃ can be ignored two values of B, C and depart from the influence that standard value causes to measurement, only considers that the A value departs from the influence that standard value causes to measurement.If the actual PT100 platinum resistance thermometer sensor, that uses is respectively R 0 ℃, 100 ℃ resistance value
0' and R
100', get according to formula (3)
R
100’＝R
0’(1+A’×100+B×100
2)
Be W
100'=(1+A ' * 100+B * 100
2)
W
100' be known number, when dispatching from the factory, PT100 indicated this value to be the nominal value that dispatches from the factory, obtain thus
A’＝(W
100’-1-B×100
2)/100?…?…?…?…?…?… (4)
Wherein: W
100 'Be the nominal ratio of 100 ℃ of resistance of platinum resistance thermometer sensor, and 0 ℃ of resistance,
B is a known constant, B=-5.802 * 10
-7/ ℃
As seen, can obtain revised constant A by formula (4) ' value,
Like this, for the PT100 platinum resistance thermometer sensor, of reality use,
When temperature in-100 ℃～0 ℃ scope,
R
t’＝R
0’[1+A’t+Bt
2+Ct
3(t-100)]?…?…?…?…?…?…(5)
Wherein: R
0' resistance nominal value when being 0 ℃ of platinum resistance thermometer sensor,,
A ' is by the revised constant of formula (4),
B is a known constant, B=-5.802 * 10
-7/ ℃
C is another known constant, C=-4.2735 * 10
-12/ ℃
When temperature in 0 ℃～250 ℃ scopes,
R
t’＝R
0’(1+A’t+Bt
2) …?…?…?…?…?…?…?…?…(6)
Wherein: R
0' resistance nominal value when being 0 ℃ of platinum resistance thermometer sensor,,
A ' is by the revised constant of formula (4),
B is a known constant, B=-5.802 * 10
-7/ ℃
The special use that can be calculated this platinum resistance thermometer sensor, by formula (5), (6) divides kilsyth basalt, during measurement, according to the platinum resistance thermometer sensor, value R that measures
t', utilize this special-purpose kilsyth basalt that divides to come reduced temperature t, can revise sensor effectively and depart from the error that standard value is brought to measurement.
Adopt the measurement with wet Relative Humidity Measuring, during measurement two PT100 platinum resistance thermometer sensor,s are placed wet bulb, dry bulb respectively, the temperature difference by wet and dry bulb converses relative humidity.Must two passage pairings use when measuring humidity, the agreement channel number is that the passage of odd number just can be set at the passage of measuring humidity, and its previous passage must be a thermometric degree passage.The ultimate principle of measurement with wet is that the temperature difference by wet and dry bulb converses envionmental humidity, so the raising of temperature measurement accuracy also just means the raising of moisture measurement precision.When measuring humidity,, suitably select wet and dry bulb coefficient and air pressure will help improving the degree of accuracy of moisture measurement according to measurement environment.Have four according to national standard (GB 6999-86) wet and dry bulb coefficient value, air pressure is divided into four grades.Instrument can be selected wet and dry bulb coefficient and atmospheric pressure value.
The touring detection belongs to measurement at a slow speed, the passage monitoring time is spaced apart a second level, instrument detects a passage every 1 to 5 second, can select double integrator type high-precision a/d converter, according to measurement range and measuring accuracy requirement, select price economy for use and higher biproduct somatotype four and half A/D converters of precision, model is ICL7135.In order to guarantee measuring accuracy, constant current source must have higher stability.In addition, the steady current of the sensor of flowing through should guarantee that sensor is controlled in the permissible error scope because of the electric current heating smaller or equal to 1mA.
To shown in Figure 10, be the process flow diagram of the error correcting method of the software workflow figure of the external computing machine of the embodiment of the invention and platinum resistance thermometer sensor, as Fig. 4.Be illustrated in figure 4 as external computer software function module process flow diagram, to each functional module of external computer software, details are as follows for workflow:
The user is before beginning to measure, but the setting measurement parameter, measurement parameter setting module process flow diagram is as shown in Figure 5 preserved the measurement data time interval can be set at 0 to 60 minute, and measurement data is not preserved in 0 expression, only shows measurement data.During measurement, whenever finish and whether differentiate last difference of preserving measurement data time and current time behind the channel measurement more than or equal to preserving measurement data time interval setting value, if greater than setting value, the preservation measurement data.The passage monitoring time is set at interval and can be set at 1 to 5 second, and the passage monitoring time arrives the stand-by period of gathering next channel data after being meant at interval and gathering a channel data.Channel number is that the passage of odd number can be set to measure temperature, measures humidity or not use one of three kinds of states; Channel number is that the passage of even number can be set to measure temperature or not use one of two kinds of states; When certain passage is set measurement humidity, system's passage of its front automatically is set to measure temperature.The state of passage is represented with the channel status sign.
Wet and dry bulb coefficient and air pressure are selected the module process flow diagram as shown in Figure 6, and the user suitably selects wet and dry bulb coefficient and ambient pressure according to measurement environment, and in standard GB 6999-86, the wet and dry bulb coefficient value has four, and ambient pressure is divided into four grades.
As shown in Figure 7 to the special-purpose kilsyth basalt generation module process flow diagram that divides of the platinum resistance thermometer sensor, of this passage of platinum resistance thermometer sensor, correction, the user selects to wish the passage revised, the nominal value R that input PT100 platinum resistance thermometer sensor, dispatches from the factory
0' and W
100 ', the user confirms that the back system is with R
0' and W
100 'Two values are stored into database, and if database table filename RW is R
0' ≠ 100 Ω, and W
100 '≠ 1.3851, then calculate the platinum resistance thermometer sensor, that produces this passage special use and divide kilsyth basalt according to formula (5), formula (6).
Be illustrated in figure 8 as temperature and humidity measurement module process flow diagram; Illustrate that measuring process is as follows:
Before the measurement beginning, system ejects " input measurement project summary record " dialog box, waits for user's input measurement project summary record, measures the project summary record and comprises the measurement date, measures bullets, measures project name, surveyor's name etc.After the user imported summary record and affirmation, system entered the measurement state.Gating Rx passage allows the constant-current source circuit 2 electric currents Rx passage of flowing through, Rx resistance value 197.60 Ω ± 0.05%, and external computing machine 6 reads in Rx passage both end voltage, calculates constant-current source circuit 2 output current values according to Ohm law then.Channel number resets 0, since No. 0 passage scanning, skip obsolete passage,, will withdraw from the measurement state if 30 passages all are set at not user mode by the user, return the last layer interface, be set at the passage of measurement up to certain by the user,, allow constant-current source circuit 2 electric currents this passage of flowing through according to channel number gating passage, external computing machine 6 reads in the platinum resistance sensor both end voltage, calculates thermoelectric resistance.Do you whether differentiate outrange, sensor line open circuit, short circuit? if, show error message, stop to measure; If not, according to the PT100 platinum resistance thermometer sensor, nominal value R that dispatches from the factory of input
0' and W
100 'Select the reduced temperature method,
Detect 0 ℃ of resistance nominal value of PT100 platinum resistance thermometer sensor, R of this channel presetting
0' and the nominal ratio W of 100 ℃ of resistance and 0 ℃ of resistance
100 ',
If 0 ℃ of resistance nominal value R
0' be not equal to standard value 100 Ω, the nominal ratio W of 100 ℃ of resistance and 0 ℃ of resistance
100 'Equal standard value 1.3851, that is, if R
0' ≠ 100 Ω, W
100 '=1.3851, then according to the platinum resistance thermometer sensor, value R that measures
T ', obtain platinum resistance thermometer sensor, standard value R through revising with formula (1)
t, divide kilsyth basalt to converse corresponding temperature according to the platinum resistance thermometer sensor, standard again;
If 0 ℃ of resistance nominal value R
0' be not equal to standard value 100 Ω, the nominal ratio W of 100 ℃ of resistance and 0 ℃ of resistance
100 'Be not equal to standard value 1.3851, that is, if R
0' ≠ 100 Ω, W
100 '≠ 1.3851, then according to the platinum resistance thermometer sensor, value R that measures
T ', converse corresponding temperature by the special-purpose kilsyth basalt that divides of the platinum resistance thermometer sensor, of this passage;
Under other situations, i.e. 0 ℃ of resistance nominal value R
0' equal standard value 100 Ω, the nominal ratio W of 100 ℃ of resistance and 0 ℃ of resistance
100 'Equal standard value 1.3851, then according to the platinum resistance thermometer sensor, value R that measures
T ', divide kilsyth basalt to converse corresponding temperature according to the platinum resistance thermometer sensor, standard.
Next step is to differentiate when prepass whether measure humidity, if, earlier according to wet-bulb depression, promptly previous channel temperature and this channel temperature poor, conversion humidity shows measured value again; If not, directly show measured value.Whether next step is to arrive the differentiation preservation measurement data time, if measurement data is saved in database; If not, do not preserve measurement data.Whether next step is to differentiate the user to send and stop to measure instruction, if, stop to measure, withdraw from the measurement state; If not, channel number adds 1, repeats above-mentioned steps, and passage is to the last finished one and taken turns and patrol and examine.Before a beginning new round was patrolled and examined, gating Rx passage was asked for constant-current source circuit 2 output current values.So repeatedly, each being measured passage goes the rounds to detect.
Data management module process flow diagram as shown in Figure 9; Data management comprises backup, deletion, inquiry, printing etc.Data backup is the place that the database file that will deposit measurement data copies user's appointment to.Fuzzy query supported in the qualified record of input inquiry conditional search.Can print the data that find or deletion action, printing or deletion action are all carried out item by item by the measurement project.
Figure 10 is the process flow diagram of the error correcting method of the platinum resistance thermometer sensor, in the external computer software measurement module process flow diagram, before the reduced temperature of tabling look-up, and the respective channel PT100 platinum resistance thermometer sensor, that presets among the first sense data library file RW nominal value R that dispatches from the factory
0' and W
100 ', select the reduced temperature method according to following three kinds of situations again:
1. if having only R
0' depart from standard value, ask standard value R with formula (1) earlier through correction
t, search the standard platinum thermal resistance again and divide kilsyth basalt to converse R
tThe temperature that value is corresponding;
2. if R
0' and W
100 'All depart from standard value, the platinum resistance thermometer sensor, special use that can be calculated this passage by formula (5), (6) divides kilsyth basalt, utilizes this special-purpose kilsyth basalt that divides to come reduced temperature;
3. if two all is standard value, the employing standard is divided the kilsyth basalt reduced temperature.
First kind of situation is only to consider R
0' depart from standard value and bring the modification method of error to measurement, second kind of situation is to consider R simultaneously
0' and W
100 'All departing from standard value, to bring the modification method of error, the third situation to measurement be not need the special circumstances revised.
Claims (8)
1. temperature and humidity inspection measuring instrument, it is characterized in that: comprise channel selection circuit, constant-current source circuit, signal amplification circuit, A/D change-over circuit and usb bus interface module, a plurality of measured elements, wherein each measured element constitutes the loop through channel selection circuit and constant-current source circuit, wherein the voltage at each measured element two ends is input to the signal amplification circuit amplification through channel selection circuit, convert digital signal to through the A/D change-over circuit again, be input to the data input pin of usb bus interface module, the data output end output gating road control signal of described usb bus interface module, and being input to the passage gating control end of channel selection circuit, the USB interface of described usb bus interface module connects external USB interface of computer;
The different gating road control signal of data output end output of the described usb bus interface module of external computer control, the passage at each measured element place of gating in turn, thereby described a plurality of measured elements, the voltage at its two ends are input to signal amplification circuit in turn and amplify.
2. temperature and humidity inspection measuring instrument according to claim 1, it is characterized in that: described a plurality of measured elements, one of them is that resistance does not vary with temperature and the accurate wire-wound resistor that changes the platinum resistance sensor that all the other change for resistance varies with temperature.
3. temperature and humidity inspection measuring instrument according to claim 1 and 2, it is characterized in that: described channel selection circuit comprises three multichannel analog switches, described a plurality of measured element, wherein an end one tunnel of each measured element connects the input end of first multichannel analog switch, another road connects the input end of second multichannel analog switch, the other end of described each measured element, one the tunnel connects the input end of the 3rd multichannel analog switch, another road ground connection, the output termination constant-current source circuit of described first multichannel analog switch, an input end of the output termination signal amplification circuit of described second multichannel analog switch, another input end of the output termination signal amplification circuit of described the 3rd multichannel analog switch, the gating road control signal of the data output end output of described usb bus interface module, after driver drives, be input to the passage gating control end of described three multichannel analog switches.
4. temperature and humidity inspection measuring instrument according to claim 1 and 2 is characterized in that: described a plurality of measured elements are divided into some groups, described channel selection circuit comprise and the some groups of corresponding some groups of channel circuits of measured element and the group gating circuit,
Described some groups of channel circuits, wherein each group channel circuit comprises first multichannel analog switch, second multichannel analog switch and the 3rd multichannel analog switch, described group of gating circuit, comprise first multichannel analog switch of group, second multichannel analog switch of group and organize the 3rd multichannel analog switch
Described some groups of measured elements, wherein an end one tunnel of each the measured element in each group connects the input end of first multichannel analog switch of corresponding group channel circuit, another road connects the input end of second multichannel analog switch of corresponding group channel circuit, the other end of each the measured element in described each group, one the tunnel connects the input end of the 3rd multichannel analog switch of corresponding group channel circuit, another road ground connection
Described some groups of channel circuits, the input end of first multichannel analog switch of group of the output termination group gating circuit of first multichannel analog switch of each group channel circuit wherein, the input end of second multichannel analog switch of group of the output termination group gating circuit of second multichannel analog switch of each group channel circuit, the input end of the 3rd the multichannel analog switch of group of the output termination group gating circuit of the 3rd multichannel analog switch of each group channel circuit
Described group of gating circuit, wherein organize the output termination constant-current source circuit of first multichannel analog switch, an input end of the output termination signal amplification circuit of second multichannel analog switch of group, organize another input end of the output termination signal amplification circuit of the 3rd multichannel analog switch
The gating road control signal of the data output end output of described usb bus interface module is divided into passage gating signal and group gating signal, the gating road control signal that described passage gating signal is some groups of channel circuits, be used to control the passage at the measured element of gating place, described group of gating signal is for organizing the gating road control signal of gating circuit, be used for a certain group of some groups of channel circuits of gating, the passage gating signal of the data output end output of described usb bus interface module, after driver drives, be input to first multichannel analog switch of each the group channel circuit in the described some groups of channel circuits, the passage gating control end of second multichannel analog switch and the 3rd multichannel analog switch, the group gating signal of the other data output end output of described usb bus interface module, after driver drives, be input to first multichannel analog switch of group of group gating circuit, organize the passage gating control end of second multichannel analog switch and the 3rd multichannel analog switch of group.
5. temperature and humidity inspection measuring instrument according to claim 1, it is characterized in that: described A/D change-over circuit comprises A/D conversion chip sum counter, after the CLK clock signal of A/D conversion chip and BUSY busy signal carry out the logical and operation, be input to the input end of clock of counter as count pulse, so that the width to BUSY output signal high level is counted, the digital signal that the count value of described counter output converts to as the A/D change-over circuit.
6. temperature and humidity inspection measuring instrument according to claim 5, it is characterized in that: described A/D conversion chip adopts the ICL7135 chip, described counter adopts two 74LS590 eight-digit binary number counters, the CLK clock signal terminal of described A/D conversion chip and BUSY busy signal end are connected with the input end of a Sheffer stroke gate in the CD4011 Sheffer stroke gate respectively, the input end of clock of a 74LS590 eight-digit binary number of the output termination counter of this Sheffer stroke gate, the input end of clock of another 74LS590 eight-digit binary number counter of carry output termination of this counter, the common formation of described two 74LS590 eight-digit binary number counters 16 digit counters, the count value of this 16 digit counter output is input to the data input pin of usb bus interface module as digital signal, and the clear terminal of described two 74LS590 eight-digit binary number counters connects the one digit number of usb bus interface module jointly according to output terminal.
7. the error correcting method of platinum resistance thermometer sensor, in the temperature and humidity inspection measuring instrument, this method comprises the following steps:
Detect 0 ℃ of resistance nominal value of platinum resistance thermometer sensor, R of this channel presetting
0' and the nominal ratio W of 100 ℃ of resistance and 0 ℃ of resistance
100', if 0 ℃ of resistance nominal value R
0' be not equal to standard value, the nominal ratio W of 100 ℃ of resistance and 0 ℃ of resistance
100' equal standard value, then according to the platinum resistance thermometer sensor, value R that measures
t', according to formula:
R
t＝R
t’(R
0/R
0’)
Wherein: R
0Standard electric resistance when being 0 ℃,
R
0' resistance nominal value when being 0 ℃;
Obtain platinum resistance thermometer sensor, standard value R through revising
t, divide kilsyth basalt to converse corresponding temperature according to the standard platinum thermal resistance again;
If 0 ℃ of resistance nominal value R
0' be not equal to standard value, the nominal ratio W of 100 ℃ of resistance and 0 ℃ of resistance
100' be not equal to standard value, then according to the platinum resistance thermometer sensor, value R that measures
t', converse corresponding temperature by the special-purpose kilsyth basalt that divides of the platinum resistance thermometer sensor, of this passage;
If 0 ℃ of resistance nominal value R
0' equal standard value, the nominal ratio W of 100 ℃ of resistance and 0 ℃ of resistance
100' equal standard value, then according to the platinum resistance thermometer sensor, value R that measures
t', divide kilsyth basalt to converse corresponding temperature according to the standard platinum thermal resistance.
8. error correcting method according to claim 7, wherein, the special-purpose kilsyth basalt that divides of the platinum resistance thermometer sensor, of described passage obtains according to following step:
At first, according to formula:
A’＝(W
100’-1-B×100
2)/100
Wherein: W
100' be the 100 ℃ of resistance of platinum resistance thermometer sensor, of this passage and the nominal ratio of 0 ℃ of resistance,
B is a known constant,
Obtain revised constant A ' value,
Then:
When temperature in-100 ℃～0 ℃ scope, by formula
R
t’＝R
0’[1+A’t+Bt
2+Ct
3(t-100)]
Wherein: R
0' resistance nominal value when being 0 ℃ of the platinum resistance thermometer sensor, of this passage,
A ' is described revised constant,
B is a known constant,
C is another known constant,
When temperature in 0 ℃～250 ℃ scopes, by formula
R
t’＝R
0’(1+A’t+Bt
2)
Wherein: R
0' resistance nominal value when being 0 ℃ of the platinum resistance thermometer sensor, of this passage,
A ' is described revised constant,
B is a known constant,
Obtain the special-purpose kilsyth basalt that divides of platinum resistance thermometer sensor, of this passage, during measurement, according to the platinum resistance thermometer sensor, value R that measures
t', utilize this special use to divide kilsyth basalt to converse corresponding temperature t.
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| CNB2004100281656A CN100337099C (en) | 2004-07-21 | 2004-07-21 | Temp. moisture monitoring meter and method for correcting error of platinum thermal resistance |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103884439A (en) * | 2014-04-16 | 2014-06-25 | 中怡(苏州)科技有限公司 | Electronic device and method for detecting environment temperature by applying electronic device |
| CN109298029A (en) * | 2018-10-23 | 2019-02-01 | 王虹 | Intelligent humidity detection device based on integral operation |
| CN112863713A (en) * | 2021-01-15 | 2021-05-28 | 中国核动力研究设计院 | Primary loop gas humidity measuring circuit for high-temperature gas cooled reactor |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2145993Y (en) * | 1992-11-21 | 1993-11-10 | 温州市电子技术研究所 | Temp signal detecting and changer for autoclave |
| CN1048560C (en) * | 1992-12-25 | 2000-01-19 | 南京航空航天大学 | Multi-Channel intelligent moisture and temp. measuring and controlling instrument |
| CN2227330Y (en) * | 1994-08-29 | 1996-05-15 | 河北省技术监督职工中等专业学校 | Self-correcting platinum resistance digital thermometer |
| US6519546B1 (en) * | 1996-11-07 | 2003-02-11 | Rosemount Inc. | Auto correcting temperature transmitter with resistance based sensor |
| CN1187620A (en) * | 1996-12-26 | 1998-07-15 | 富士电机株式会社 | Input device for multipoint temperature measuring resistors |
| CN2539962Y (en) * | 2002-04-19 | 2003-03-12 | 王海涛 | Intelligent digital thermometer with USB mouth |
| CN2747562Y (en) * | 2004-07-21 | 2005-12-21 | 中国科学院广州电子技术研究所 | Temperature-humidity polling measurer |
-
2004
- 2004-07-21 CN CNB2004100281656A patent/CN100337099C/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103884439A (en) * | 2014-04-16 | 2014-06-25 | 中怡(苏州)科技有限公司 | Electronic device and method for detecting environment temperature by applying electronic device |
| CN109298029A (en) * | 2018-10-23 | 2019-02-01 | 王虹 | Intelligent humidity detection device based on integral operation |
| CN112863713A (en) * | 2021-01-15 | 2021-05-28 | 中国核动力研究设计院 | Primary loop gas humidity measuring circuit for high-temperature gas cooled reactor |
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Effective date of registration: 20160823 Address after: 510070, Guangdong, Guangzhou province Yuexiu District martyrs Road No. 100 compound Patentee after: Guangzhou Electronic Technology Co., Ltd., Chinese Academy of Sciences Address before: 23-1, No. 100, 510070 martyrs Middle Road, Guangdong, Guangzhou Patentee before: Guangzhou Inst. of Electronic Technology, Chinese Academy of Sciences |